Every c64 at least needs a Kernal switcher to take full advantage of JiffyDOS or other useful modifications.

This Hood for the C64c case is put on top of the original case, and can keep any switches, displays, or whatever else you want; without destroying your original case.

Any cables can be pulled through the vents of the original case.

The .scad file is free for you to add your own layout.

The .stl file is a solid hood where you can add your modifications by using a Dremel and other tools.